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        "cveId": "CVE-2026-6862",
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        "state": "PUBLISHED",
        "assignerShortName": "redhat",
        "dateReserved": "2026-04-22T13:19:59.764Z",
        "datePublished": "2026-04-22T13:45:45.503Z",
        "dateUpdated": "2026-09-21T17:27:52.818Z"
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        "cna": {
            "title": "Efivar: efivar: denial of service due to stack overflow in device path node parsing",
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                        "attackComplexity": "LOW",
                        "attackVector": "LOCAL",
                        "availabilityImpact": "HIGH",
                        "baseScore": 5.5,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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            "descriptions": [
                {
                    "lang": "en",
                    "value": "A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS)."
                }
            ],
            "affected": [
                {
                    "vendor": "Red Hat",
                    "product": "Red Hat Hardened Images",
                    "collectionURL": "https://catalog.redhat.com/software/containers/",
                    "packageName": "efivar-main",
                    "defaultStatus": "affected",
                    "versions": [
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                            "version": "39-13.1.hum1",
                            "lessThan": "*",
                            "versionType": "rpm",
                            "status": "unaffected"
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                    "product": "Red Hat Enterprise Linux 10",
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                    "product": "Red Hat Enterprise Linux 7",
                    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
                    "packageName": "efivar",
                    "defaultStatus": "unknown",
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                    "packageName": "efivar",
                    "defaultStatus": "unknown",
                    "cpes": [
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                    "vendor": "Red Hat",
                    "product": "Red Hat Enterprise Linux 9",
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                    "packageName": "efivar",
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                    "cpes": [
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                    "packageName": "openshift/ose-rhel-coreos-8",
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            ],
            "references": [
                {
                    "url": "https://access.redhat.com/errata/RHSA-2026:69321",
                    "name": "RHSA-2026:69321",
                    "tags": [
                        "vendor-advisory",
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                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459982",
                    "name": "RHBZ#2459982",
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                        "issue-tracking",
                        "x_refsource_REDHAT"
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            ],
            "datePublic": "2026-04-09T00:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-674",
                            "description": "Uncontrolled Recursion",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "x_redhatCweChain": "CWE-674: Uncontrolled Recursion",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "Applications using efi_loadopt_is_valid() should validate the size of the input buffer before passing it to libefiboot. As a library-level fix, the device path iterator should enforce a minimum node Length of 4 before recursing:\n\n  if (dp->length < 4)\n      return -1;"
                }
            ],
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-04-09T00:00:00.000Z",
                    "value": "Reported to Red Hat."
                },
                {
                    "lang": "en",
                    "time": "2026-04-09T00:00:00.000Z",
                    "value": "Made public."
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Red Hat would like to thank Mathis Huron (Oteria Cyber School, FuzzingLabs) for reporting this issue."
                }
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